package com.ckf.es.service;

import com.alibaba.fastjson.JSON;
import com.ckf.es.pojo.Content;
import com.ckf.es.utils.HtmlParseUtils;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 业务层
 *
 * @author: serene
 * @date: 2020/9/23 14:15
 */
@Service
public class ContentService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    /**
     * 解析数据放到es索引中
     *
     * @param keywords
     * @return
     * @throws Exception
     */
    public boolean parseContent(String keywords) throws Exception {
        List<Content> contents = new HtmlParseUtils().parseJd(keywords);

        //把查询到的数据放到es中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");

        for (int i = 0; i < contents.size(); i++) {
            System.out.println(JSON.toJSONString(contents.get(i)));

            bulkRequest.add(
                    new IndexRequest("jd_goods")
                            .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }
        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        //如果没有失败就返回成功
        return !bulk.hasFailures();
    }


    /**
     * 获取数据之后实现搜索功能
     *
     * @param keyword
     * @param pageNo
     * @param pageSize
     * @return
     * @throws IOException
     */
    public List<Map<String, Object>> searchPage(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo <= 1) {
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit documentFields : searchResponse.getHits().getHits()) {
            list.add(documentFields.getSourceAsMap());
        }
        return list;
    }


    /**
     * 高亮查询
     * @param keyword
     * @param pageNo
     * @param pageSize
     * @return
     * @throws IOException
     */
    public List<Map<String, Object>> searchPageHighlightBuilder(String keyword, int pageNo, int pageSize) throws IOException {
        if (pageNo <= 1) {
            pageNo = 1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //高亮搜索
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        //显示多个高亮
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("<sqan style ='color:red'>");
        highlightBuilder.postTags("</sqan>");
        sourceBuilder.highlighter(highlightBuilder);

        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //解析结果
        ArrayList<Map<String, Object>> list = new ArrayList<>();
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            //查询原来的结果
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();

            //解析高亮的字段  将原来的字段换位高亮的字段就可以了
            if (title != null) {
                Text[] fragments = title.fragments();
                String n_title = "";
                for (Text text : fragments) {
                    n_title += text;
                }
                //高亮字段替换成原来的内容
                sourceAsMap.put("title", n_title);
            }
            list.add(sourceAsMap);
        }
        return list;
    }


}
